Quantum-enhanced positioning and clock synchronization

Vittorio Giovannetti, Seth Lloyd () and Lorenzo Maccone
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Vittorio Giovannetti: Massachusetts Institute of Technology, Research Laboratory of Electronics, MIT36-497
Seth Lloyd: Massachusetts Institute of Technology, MIT3-160
Lorenzo Maccone: Massachusetts Institute of Technology, Research Laboratory of Electronics, MIT36-497

Nature, 2001, vol. 412, issue 6845, 417-419

Abstract: Abstract A wide variety of positioning and ranging procedures are based on repeatedly sending electromagnetic pulses through space and measuring their time of arrival. The accuracy of such procedures is classically limited by the available power and bandwidth. Quantum entanglement and squeezing have been exploited in the context of interferometry1,2,3,4,5, frequency measurements6, lithography7 and algorithms8. Here we report that quantum entanglement and squeezing can also be employed to overcome the classical limits in procedures such as positioning systems, clock synchronization and ranging. Our use of frequency-entangled pulses to construct quantum versions of these protocols results in enhanced accuracy compared with their classical analogues. We describe in detail the problem of establishing a position with respect to a fixed array of reference points.

Date: 2001
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DOI: 10.1038/35086525

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